need help for webcam....

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i have iBall webcam with 12 megapixel.i use yahoo messenger v.11 to chat with my brother.he teaches me some lessons of my important subject on video call.i want to record that whole call..please help me for following queries.. 1..how to record video call on yahoo messenger ? 2..if can't record on yahoo....is this facility available on skype?? 3..anyother software to make n record video call?? any help regarding this issue is welcome.......